WO2002068735A1 - Production method of synthetic fiber and yarn traverse device - Google Patents

Abstract

Melt-spun synthetic fiber yarns are stretched/heat treated via a plurality of godet rollers, and godet rollers that provide a surface roughness of 0.5 ≤ Ra ≤ 5 on at least two roller surfaces and a surface temperature of at least 70°C (melting point of synthetic fiber) at one of the two rollers are used at the subsequent taking up to subject the yarns to multi-stage stretching/heat treating while being reciprocatingly moved in the godet roller's rotation axis direction, whereby it is possible to restrict adherend deposition on the surfaces of godet rollers, eliminate yarn breaking and feather producing, and provide synthetic fibers capable of improving availability and a production efficiency.

Description

 Description Synthetic fiber production method and yarn traverse device

 According to the present invention, in the production of synthetic fibers, particularly industrial fibers, in which undrawn yarn is drawn and heat-treated using a plurality of godet rollers to produce a drawn yarn, there is no deposit on the surface of the high-temperature godet roller. In order to prevent problems such as yarn breakage and fluffing by suppressing the accumulation, to maintain the drawing and heat treatment of synthetic fibers stably for a long period of time, and to remove deposits on the godet roller. The present invention relates to a method for producing a high-strength synthetic fiber, which improves the operation rate by reducing the number of stoppages, and further reduces the wear on the surface of the godet roller, thereby improving production efficiency, and a yarn traverse device directly used in the production method. Things. Background art

In the production of synthetic fibers typified by polyamides and polyesters, especially synthetic fibers for industrial use, generally, undrawn yarn is thermally drawn at high magnification and under high tension using a plurality of godet rollers. Therefore, it is necessary to achieve high strength. For this reason, at least one godet roller in a group of a plurality of godet rollers needs to be set to a high temperature in order to heat set the yarn drawn at a high magnification. In the process of drawing and heat-treating the undrawn yarn, foreign matter falling off the running yarn adheres and accumulates on the surface of the godet roller 1 with time. A phenomenon occurs in which the drawing state becomes abnormal, and the quality of the fiber obtained by this phenomenon has a problem of seriously affecting the quality and production efficiency.

 Abnormalities in the stretched state referred to here mean that the surface frictional force is high due to foreign matter adhering and accumulating on the surface of the godet roller, the running yarn is wound around the godet roller, The single yarn may be cut and become fluff, and the yarn itself may be cut.

 In addition, foreign matters adhering and accumulating on the godet roller, which is set at a high temperature near the polymer melting point, impede heat transfer between the godet roller and the yarn, and as a result, heat treatment of the yarn is sufficiently performed. Unfavorable phenomena such as the quality and quality of the obtained drawn yarn changing with time are also observed. Since the surface contamination of the godet roller set at a high temperature occurs in a relatively short time and causes the above-mentioned abnormal state of the drawn state, the yarn is forcibly applied periodically or whenever the abnormal state is detected. Frequently, cutting is performed to stop the stretching device to remove deposits on the godet roller, and the problems of lowering production efficiency and lowering product quality due to this are greatly highlighted. Was.

 Here, as the deposits deposited on the godet roller, there are mainly fixed substances generated by the oil agent applied to the yarn being denatured by heat on the stretching heat treatment roller, and genuine sesame seeds precipitated from the yarn. And their thermal metabolites and the Siri force contained in water.

 As a method of avoiding and removing the stretching abnormality due to such deposits, the following conventional techniques can be cited.

In other words, Japanese Patent Application Laid-Open Nos. 9-78464 and 8-187469 For each of the devices, there has been proposed a device for cleaning attached deposits by bringing a scraper blade or a rotating brush into contact with the surface of a godet roller. However, in the production of industrial fibers, a high-temperature heating roller is often used as a godet roller.Therefore, the above-mentioned scraper blade or rotating brush makes it easy to remove the attached deposits. Can not. Furthermore, since high-tensile yarns are drawn with high tension, breakage of devices such as scraper blades and rotating brushes installed in close proximity to the godet roller occurs frequently due to the thread with one roll generated after cutting the yarns. There was also a problem that would.

 Further, Japanese Patent Application Laid-Open No. Hei 8-170215 proposes a method and an apparatus for reciprocating (traverse) a running yarn on a godet roller by a yarn path guide in the field of manufacturing textile fibers. ing.

However, the production of industrial fibers usually has a greater fineness than that of clothing fibers and is stretched at a high magnification, so that single yarn breaks and yarn breaks occur more often than in the production of clothing fibers. Notable. Furthermore, since the surface temperature is set higher than that of the godet roller used in the production of textiles for clothing, the accumulation of deposits due to the thermal modification of the oil agent on the godet roller is remarkable, which has an effect. The problem is that it clearly appears in the quality of the yarn to be produced. Therefore, simply causing the yarn to reciprocate on the godet roller using the yarn path guide cannot sufficiently prevent the formation of the oil agent alteration, and the alteration accumulates at both ends of the amplitude of the reciprocation, These deposits cause an increase in yarn breakage, fluff, etc. over time. To prevent this, many stoppages had to be made in order to remove the deposits on the godet rollers, and the operation rate could not be improved. Furthermore, in the production of industrial fibers, in many cases, a drawing auxiliary device between multiple drawing rollers, that is, an air guide to prevent breakage of single yarn on the rollers, and a heat treatment tube to fix the draw point Since a hot plate, a heat treatment tube, and the like are provided for drawing assistance, when the traveling yarn is reciprocated, a deviation occurs between the drawing assistance device and the traveling yarn. There was also a problem that the running yarn was cut due to the rubbing with the rubber. Disclosure of the invention

 An object of the present invention is to produce a drawn fiber by stretching and heat-treating an undrawn yarn using a plurality of godet roller groups to produce a drawn yarn, particularly an industrial fiber. By performing high-temperature and high-magnification stretching while suppressing the accumulation of deposits, the drawbacks such as yarn breakage and fluff, which are remarkable in industrial fibers, are eliminated, and high-strength synthetic fibers are stretched and heat-treated. A method for producing synthetic fibers that maintains stability for a long period of time, reduces the number of stoppages for removing deposits on the godet rollers, improves the operation rate, and improves production efficiency, and a yarn traverser directly used in the production method. A service device.

In order to solve the above-mentioned problems, a method for producing a synthetic fiber according to the present invention comprises a method for producing a synthetic fiber which is obtained by subjecting a melt-spun synthetic fiber yarn to multi-stage drawing and heat treatment using a plurality of godet rollers and subsequently winding it. Wherein at least two sets of the godet rollers have a surface roughness Ra of 0.5 to 5 im, and at least one set of these godet rollers has one surface. Using a godet roller having a temperature of (the melting point of the synthetic fiber is 170 ° C.) or more, and using a godet roller Reciprocating in the direction of the rotation axis of the roller.

 In the method for producing a synthetic fiber of the present invention, the following (a) to (e) are preferred modes, respectively, and by applying these conditions, it is possible to expect a further excellent effect. .

 (a) The tension of the yarn in the final drawing step of the multistage drawing is 1.4 cN / dtex or more.

 (b) the total fineness of the synthetic fiber is 2 O O d t e x or more

 (c) The yarn is a multi-thread of at least two yarns

 (d) the reciprocating motion cycle of the yarn is 5 seconds or more;

 (e) The reciprocating width Y (mm) in the reciprocating motion satisfies the following formula (Ί) X F≤Y≤2 (X P-X F) · · · · (1)

 In the formula, XF indicates the yarn width (mm), and XP indicates the yarn pitch (mm) between adjacent yarns.

Further, in the production of industrial fibers having a drawing assist device, in order to solve the problem that when the yarn is moved, fuzz is generated by rubbing between the drawing assist device and the running yarn, the synthetic fiber of the present invention is used. Is a method for producing synthetic fibers that are stretched and heat-treated by using a plurality of godet rollers, and subsequently wound up. The yarn consolidation guide that allows the yarn to pass before and after the Z or the Z or the rotation is synchronized with one or a plurality of drawing assist devices disposed between the plurality of godet rollers, thereby synchronizing the yarn. Is reciprocated in the direction of the rotation axis of the godet mouth ringer. In the method for producing a synthetic fiber, the following (f) to (U) are preferred embodiments, By applying these conditions, a better effect can be expected to be obtained.

 (f) The stretching is a multi-stage stretching of at least two or more stages.

 (g) The yarn is a multi-thread of at least two yarns

 (h) The drawing assist device is a yarn entanglement device.

 (i) The reciprocating width Y (mm) in the reciprocating motion satisfies the following expression (1).

 X F≤Y≤2 (X P-X F)

 In the formula, XF indicates the yarn width (mm), and XP indicates the yarn pitch (mm) between adjacent yarns.

 (j) The period of the reciprocating motion is 5 seconds or more.

 The yarn traversing apparatus of the present invention is an apparatus used in a method for producing a synthetic fiber in which a melt-spun synthetic fiber yarn is stretched and heat-treated through a plurality of godet rollers and wound up. A yarn bundling guide for passing the yarn before and after Z or after the yarn is rotated by the godet roller immediately after spinning; a drawing assist device disposed between a plurality of godet rollers; And a means for synchronizing the strip focusing guide and the stretching assist device.

 In the yarn traverse device of the present invention, the following (k) to (P) are preferred modes, respectively, and by applying these conditions, it is expected that a further excellent effect can be obtained. it can.

(k) Means for synchronizing the yarn collecting guide and the drawing auxiliary device include a drive motor, a shaft attached to the drive motor in the direction of the rotation axis of the godet roller, and a yarn attached to the shaft. For both focusing guide and stretching assist device Means for converting the connected rotational motion into a reciprocating motion, and the means are configured such that the thread collecting guide and the stretching assist device slide in the direction of the rotation axis of the godet roller, respectively. thing,

 (I) Means for synchronizing the yarn collecting guide and the drawing auxiliary device include at least two drive motors, a shaft attached to each of these drive motors in the direction of the rotation axis of the godet roller, and each of these shafts. The yarn focusing guide and the drawing assisting device are attached to each other, and the means for converting the rotational movement into a reciprocating movement respectively connected to the drawing assisting device and the drawing assisting device. It must be configured to slide in the direction of the roller's rotation axis.

(m) at least two phase detection means for detecting that the shaft attached to each of the drive motors has rotated to a predetermined position, wherein the means for synchronously moving the yarn collecting guide and the drawing assistance device in the above (k) is used. When the predetermined position is detected by one of the phase detecting means, the rotation of the shaft provided with the phase detecting means is stopped, and when the predetermined position is detected by the other phase detecting means, the stopped shaft is stopped. Being configured to rotate

 (n) The cycle of the reciprocating movement of the yarn bundling guide and the drawing auxiliary device is 5 seconds or more;

 (0) The yarn bundling guide and the drawing assist device are for at least two yarns, and

(p) The drawing assist device is a yarn entanglement device. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a front view schematically showing a spinning / drawing apparatus to which the yarn traverse device of the present invention is attached, FIG. 2 is a schematic side view of the apparatus shown in FIG. 1, and FIG. FIG. 4 is a schematic perspective view of a yarn traverse device according to another embodiment of the present invention, FIG. 4 is a schematic perspective view of a yarn traverse device according to another embodiment of the present invention, and FIG. FIG. 4 is a block diagram showing a control unit of FIG.

Explanation of reference numerals

1 Spinning duct,

2 Oiling roller,

3 Focusing guide mounting plate,

4, 4a, 4b drive motor,

5 Stretching assist device,

6 Focusing guide,

 7, 7a, 7b cam,

 8, 8a, 8b shaft,

 9, 9a, 9b reducer,

 1 0 Extension auxiliary device mounting plate,

 1 1 Slide rail,

 1 2 slide bearing,

 1 3, 1 3a, 1 3b Sliding rollers,

 1 4 slide axis,

15, 15 a, 15 b proximity sensor, 16, 16 a, 16 b

1 7 control board,

 18, 18a, 18b 1st godet roller,

 1 9 2nd godet roller,

 20 Third godet roller,

 2 1 4th godet roller,

 22 Fifth Godet Roller,

 23 Best mode for carrying out the invention

 Hereinafter, the method for producing a synthetic fiber and the yarn traverse device of the present invention will be described in detail.

 Examples of the synthetic fiber used in the production method of the present invention include yarns made of polyamide, polyester, polyolefin, and aramide.The spun yarn can be stretched and heat-treated using a godet roller. There is no particular limitation as long as the material is possible.

 The surface roughness Ra of at least two sets of the godet rollers used in the present invention is required to be 0.5 to 5 μm, and preferably 1 to 3 im. .

Here, one set of godet mouth rollers is one set having the same rotation speed for turning the yarn〗 or more rounds, for example, the first godet roller (18a and〗 8b) in Fig. 1. Means roller. The surface roughness Ra is as follows: According to JISB0601, using a Surfcorder SE 1700 manufactured by Kosaka Lab, stylus radius 2 im, feed rate 0.5 mm, cutoff 0.8 mm or 2. It is calculated by obtaining the roughness curve of the godet roller surface from the measured cross-sectional curve with 5 mm.

 When performing multi-stage drawing, if the surface of the godet roller to be drawn has a roughness within this range, the drawing is performed not only between the rollers but also during the multiple turns of the yarn on the rollers. Done. When 8 & is smaller than 0.5 im or larger than 5 im, the frictional force acting between the yarn and the roller increases, and it is difficult to stretch the yarn on the mouth. Thus, it is difficult to obtain a high-strength fiber by suppressing the occurrence of single yarn breakage. It is preferable that the surface roughness Ra is 1 to 3 im because the frictional force is further reduced. In addition, by setting the surface temperature of at least one of the two godet rollers to be equal to or higher than the melting point of the synthetic fiber yarn (70 ° C), heat treatment can be effectively performed on the roller surface. Can be done at any time.

 Here, the melting point of the yarn is determined by melting 2 mg of sample using Perkin-Elmer DSC-7, solidifying it rapidly with liquid nitrogen, and scanning the sample at a rate of 20 ° C / min. The maximum endothermic peak temperature is determined from the calorific value change trace obtained in this way.

If the temperature is lower than this temperature (the melting point of the synthetic fiber yarn is less than 70 ° C), the drawing cannot be performed stably, and the thermal dimensional stability of the drawn yarn is reduced due to insufficient heat treatment. It is not preferable for the production of industrial fibers which is the object of the present invention. When heat treatment is performed under such high temperature conditions, oil adhering to the yarn on the godet roller surface The heat-transformed product caused by the agent accumulates and causes breakage of single yarns and yarn breakage. In the present invention, by reciprocating the yarn in the rotation axis direction of the godet roller, such a modified oil-based product is produced. Deposition can be prevented. That is, the present invention can suppress the denaturation and accumulation of the residue caused by the oil agent by organically combining the above structures, and stably produce high-strength industrial fibers. Gain. If the surface roughness Ra of the roller for performing the heat treatment is smaller than 0.5 im, the contact area between the traveling yarn and the roller becomes large, so that the yarn is moved in the rotation axis direction of the godet roller. However, the effect of the present invention cannot be obtained because the denatured product sticks to the roller surface and the denatured product accumulates at both ends of the movement amplitude. On the other hand, when the surface roughness Ra of the mouth roller is set to 0.5 to 5 im and the yarn is moved in the direction of the rotation axis of the godet roller, the accumulation of the oil-modified product can be prevented. The invention is achieved. Furthermore, the effect of the present invention is remarkably exhibited by setting to 3 im.

 Further, by moving the yarn collecting guide, when the yarn is reciprocated, if the yarn path guide is simply moved, the yarn breaks due to the loosening of the yarn due to the loosening of the yarn. Can be prevented.

 Here, the yarn bundle guide serves to organize running yarns when the synthetic fiber is spun and drawn, and is preferably a guide used for organizing spun yarns.

In addition, as a method of reciprocating the yarn collecting guide, a method of using a means for converting the rotational movement into a reciprocating movement, that is, a method of changing the rotational movement of the motor into a reciprocating movement by a cam, a method of reciprocating the rotational movement of the motor by a ball screw How to turn into exercise, A reciprocating motion by repeating the linear motion of the Linda; and a reciprocating motion via a gear in a stepping mode; ^ method.

 Further, when the total fineness is 200 dtex or more, the effect of the present invention becomes remarkable because the amount of oil applied to the roller increases.

 Further, in the present invention, more remarkable effects can be obtained by setting the stretching tension in the final stretching step to 1.4 cN / dtex or more. That is, when the drawing tension is not less than this value, a high-strength fiber of 6.0 cNZdteX or more can be obtained, and the effect of the modified oil agent is remarkable.

 Further, the yarn used in the present invention is preferably a multi-thread of two or more yarns. In the case of two or more yarns, single yarn breakage or the like can be reduced for each yarn, so that a large synergistic effect can be obtained.

 Next, the reciprocating width Y (mm) of the reciprocating motion of the yarn preferably satisfies the following expression (1).

 X F≤Y≤2 (X P— X F) · · · · (1)

 Here, XF in the expression represents the yarn width (mm), and XP represents the yarn pitch (mm) between adjacent yarns.

 This indicates the point where the yarn deviates from the position where the yarn originally traveled, that is, from the yarn width XF to the point where the adjacent yarn arrives at the position where the yarn originally traveled. As a result, not only is it possible to effectively suppress the attached deposits, but also the effect of suppressing the wear of the godet roller surface is increased.

Furthermore, the reciprocating cycle of the yarn collecting guide is preferably 5 seconds or more from the viewpoint of reducing the damage of the running yarn on the godet roller and reducing the failure rate of the traverse device. More preferably, 30 seconds or more are more preferable.

 In the production of an industrial fiber having a drawing assisting device, in a godet roller immediately after spinning, a yarn bundling guide for passing the yarn before and after Z or after the yarn is swirled, and the plurality of godets When the yarn is reciprocated in the rotation axis direction of the godet roller by synchronizing one or more drawing assist devices arranged between the rollers, the single yarn is rubbed by the yarn and the drawing assist device. It is possible to prevent cuts and the like from occurring.

 The drawing assisting device is a yarn entanglement device to prevent single yarn breakage on the roller, a heat treatment tube for fixing draw points, a hot plate for drawing assistance, and a heat treatment tube to assist drawing smoothly. This is a generic term for the devices that perform the operations.

 Furthermore, in the present invention, the term “synchronous” means that the yarn collecting guide and the drawing auxiliary device have a certain relationship when reciprocating, and preferably, both of the yarn collecting guide and the drawing auxiliary device. It means that it has a certain phase difference when reciprocating.

 Furthermore, in the present invention, the direction of the rotation axis of the godet roller means that one component of the motion vector is parallel to the direction of the rotation axis of the godet roller. In addition, as a method of reciprocating the yarn bundle guide and the drawing assist device, there are a method of changing the rotational motion of the motor into a reciprocating motion by a cam, a method of changing the rotational motion of the motor into a reciprocating motion by a ball screw, In addition, there are a method of reciprocating the cylinder by repeatedly performing a linear motion of the cylinder, and a method of reciprocating the stepping motor via a gear.

Also, as a method of synchronizing the yarn bundle guide and the drawing auxiliary device, two or more When using a motor / cylinder of the same type, a method of detecting and synchronizing the position of the rotary shaft / cylinder and the position of the thread using a sensor, and synchronizing the output of one motor / cylinder, etc. It is preferable to use a method in which the yarn is collected by a shaft, and the yarn is bundled through a cam or gear to synchronize the yarn collecting guide with the drawing auxiliary device.

 Further, the yarn used in the present invention is preferably a multi-thread of two or more yarns. In the case of two or more yarns, single yarn breakage or the like can be reduced for each yarn, so that a large synergistic effect can be obtained. As described above, in the case of a multi-filament yarn having two or more yarns, the yarn bundling guide should be designed for each yarn, that is, the number of yarns should be set, and all yarns should reciprocate simultaneously. Is preferred.

 When the drawing assisting device is a yarn entanglement device, it is necessary to position the yarn at the air blowing intersection, which is sensitive to the displacement of the running yarn. By reciprocating in synchronism, effects such as a reduction in single yarn breakage appear particularly remarkably.

 Next, by setting the reciprocating width Y (mm) of the reciprocating motion of the yarn so as to satisfy the above-mentioned formula (1), it is possible to effectively control the adhered sediment. The effect of suppressing the abrasion of the roller surface also increases.

 Further, from the viewpoint of reducing the damage of the running yarn on the godet roller and reducing the failure rate of the traverse device, the reciprocating motion cycle of the yarn collecting guide is preferably 5 seconds or more, more preferably 30 seconds or more. .

Next, the yarn traverse device of the present invention will be described with reference to the drawings. FIG. 1 is a front view schematically showing a spinning / drawing apparatus equipped with the yarn traverse device of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a second actual example of the yarn traverse device of the present invention. FIG. 4 is a schematic perspective view showing a third embodiment of the present invention, and FIG. 5 is a block diagram of control means of the phase detection device in the embodiment shown in FIG.

 The yarn traverse device of the present invention is used directly in the above-described method for producing a synthetic fiber, and passes through the yarn before or after Z or rotation by the godet roller immediately after spinning. The focusing guide to be moved is reciprocated (traversed), and in synchronization with this, one or more of the stretching assist devices are traversed. In other words, the yarn traverse device of the present invention is a device for suppressing the accumulation of deposits on the surface of the godet roller during spinning and drawing of the synthetic fiber yarn, and rotates the yarn by the godet roller immediately after spinning. Pass the yarn before and / or after it is swirled. Reciprocate in the rotation axis direction of the godet roller while synchronizing the yarn bundling guide and the drawing assist device arranged between the godet rollers. It is characterized by comprising means.

As shown in FIG. 1 and FIG. 2, a plurality of synthetic fiber yarns (2 3) are spun from a spinning duct (1), supplied with oil by an oiling roller (2), and then attached to a mounting plate. After passing through the focusing guide (6) attached to (3), it is pre-stretched between the first godet roller (18) and the second godet roller (19), and the second godet roller (19) And a third stage between the third godet roller (20) and the fourth godet roller (21), and a second stage between the third godet roller (20) and the fourth godet roller (21). Furthermore, it is relaxed between the fourth godet roller (21) and the fifth godet roller (22) and wound up to the winder (W / D), but the second godet roller (19) ) And the third godet roller (20), a stretching assist device (5), for example, Device is disposed. However, The focusing guide and the stretching assist device in Ming are not limited to this position. Then, as shown in FIG. 2, a means for synchronizing and moving the focusing guide (6) and the stretching assist device (5) in parallel, that is, a drive motor (4), and this drive motor (4) A shaft (8) attached in the direction of the rotation axis of the godet roller, and two cams (7) attached to this shaft (8) and connected to both the focusing guide (6) and the stretching assist device (5) ) Is provided, and by such means, the focusing guide (6) and the stretching assist device (5) can be moved accurately in synchronization with each other, whereby the yarn (23) Reciprocates in the direction of the rotation axis of the godet roller with respect to the running yarn.

 FIG. 3 shows a second embodiment of the yarn traverse device according to the present invention. In this device, a shaft (8) is attached to a drive motor (4). The drive motor (4) and the shaft may be in direct contact with each other, but it is preferable to use a reduction gear (9) as shown in the figure, because the desired rotation speed can be obtained. It can be moved at a sufficiently low speed so as not to give

 Two cams (7a, 7b) are attached to the shaft (8) attached to the running yarn in the direction of the rotation axis of the godet roller, and attached to the extension assist device mounting plate (10). The stretching assist device (5) and the focusing guide (6) attached to the focusing guide mounting plate (3) are fitted with sliding rollers (13a, 13a) provided on the respective mounting plates (10, 3). It is in contact with each cam (7a, 7b) via 1 3b).

The extension assisting device mounting plate (〗 0) is mounted on a stationary slide rail (11) so as to slide in the longitudinal direction of the shaft (8). Furthermore, the focusing guide mounting plate (3) is similarly mounted on a stationary slide bearing (1 2) using a slide shaft (1 4) so that it can slide in the longitudinal direction of the shaft (8). It has become.

 Therefore, with the above structure, the focusing guide mounting plate (3) and the extension auxiliary device mounting plate (10) are provided along the grooves of the two cams (7a, 7b) rotated by the drive motor (4). As the sliding rollers (13a, 13b) move, the focusing guide mounting plate (3) moves along the length of the shaft (8) to the slide bearings (1 2) and the slide shaft (1 4). When the extension assist device mounting plate (10) slides on the slide rail (11), the focusing guide (6) and the extension assist device (5) move in the direction of the godet roller's rotation axis. They reciprocate synchronously.

 FIG. 4 shows a third embodiment of the yarn traverse device according to the present invention. In this device, the convergence guide (6) and the stretching auxiliary device (5) are each provided with a separate drive motor (4a). ) And (4 b) are mounted on separate shafts (8a, 8b) via separate cams (7a, 7b) to reciprocate, and each cam (7 A phase detection means for detecting that a, b) has rotated to a predetermined position is attached, and the control panel (17) shown in Fig. 5 detects the predetermined position by the phase detection means on either side. In this case, the rotation of the shaft provided with the phase detecting means is stopped, and when the predetermined position is detected by the other phase detecting means, the stopped shaft is rotated to synchronize.

That is, in the third embodiment, the focusing guide (6) and the stretching assist device (5) are driven by the separate driving motors (4a, 4b), except that It reciprocates by the same structure as the means of the first embodiment.

 Further, as the phase detecting means in the third embodiment, the following can be mentioned. That is, each of the cams (7a, 7b) has a detected part (16a, 16a,

16 b) are attached, and the proximity sensor (15 a, 15 b) is attached to the part that cannot be rotated by the drive motor (4 a, 4 b) such as a reduction gear (9 a, 9 b). b) is provided for each. These proximity sensors (15a, 15b) can be mounted at any location as long as they cannot be rotated by the drive motor (4a, 4b). For example, reduction gears (9a, 9b) ), May be provided on a bearing portion or the like, and may also be provided on a stretching machine body or the like.

 Each cam (7a, 7b) rotates, and the detected part (16a) and the proximity sensor (15a) or the detected part (16b) and the proximity sensor (15b) face each other. In this case, the signal output from the proximity sensor (15a, 15b) is reflected by the detected part (16a, 16b) and detected by the proximity sensor (セ ン サ 5a, 15b). Is done.

Then, when the proximity sensor detects the object to be detected, the detection signal is input to the control panel (17). The control panel (17) is connected to the proximity sensor (15a) and proximity sensor (15b) and the drive motor (4a) and drive motor (4b) as shown in Fig.5. For example, when a detection signal is input by one of the proximity sensors (15a), the drive motor (4a) provided with the proximity sensor (15a) stops rotating and the other proximity sensor (15a) stops rotating. When a detection signal is input by the sensor (15b), the stopped drive motor (4a) is configured to rotate. Here, the proximity sensor used in the present invention is preferably a photoelectric proximity sensor, but may be a capacitance type or a magnetic type as long as it achieves a desired purpose. According to the third embodiment, the focusing guide (6) and the stretching assist device (5) reciprocate accurately and synchronously. If there is more than one extension assist device, the rotation is stopped sequentially from the drive motor equipped with the proximity sensor to which the detection signal was input first, and all stops when the last detection signal was input during one round trip It is only necessary to drive the drive motor by the control panel.

 The aspect of the third embodiment is effective when it is difficult to drive the focusing guide and the extension assisting device by one shaft.

 In addition, the cycle of the reciprocating motion of the yarn traverse device of the present invention is preferably 5 seconds or more, and more preferably 30 seconds or more, from the viewpoint of reducing the damage of the running yarn and reducing the failure rate of the traverse device. Is more preferable.

 Further, in order to convert the rotational movement of the shaft (8) into a reciprocating movement, a pole screw and a gear may be used instead of the above-mentioned drum (7). The use of cams is not limited to these, but the use of cams is preferred in terms of cost and ease of use. Further, by changing the shape of the cam, the traverse width of the focusing guide and the stretching assist device can be changed to a desired width. Accordingly, the focusing guide and the stretching assist device can be reciprocated in synchronization with a certain phase difference.

 By setting the shape of the cam so that the reciprocating width Y (mm) of the reciprocating motion of the yarn satisfies the above equation (1), it is possible to effectively suppress the attached deposits. Alternatively, the effect of suppressing the wear of the godet roller surface is increased.

The bundling guide and the drawing assisting device of the present invention do not limit the number of yarns, Preferably, it is for multiple yarns. In the case of a multi-filament yarn, dirt on the godet roller appears remarkably, so that the intended effect can be more remarkably exhibited. In the present invention, more preferable effects can be obtained when a yarn entanglement device is used as a drawing assisting device. In other words, the yarn entanglement device needs to position the yarn at the air blowing intersection, and is sensitive to the displacement of the running yarn.

 As a means for reciprocating the focusing guide and the stretching assist device, a fluid cylinder or the like may be used instead of the above-described means using the drive motor, the shaft and the cam, but from the viewpoint of repair of the device and cost. The above method is preferred.

 As described above, according to the method for producing a synthetic fiber and the yarn traverse device of the present invention, by preventing the deposits from being deposited on the godet roller, the godet roller can be kept in the initial state for a long time. In addition to being able to maintain the condition, it is possible to increase the operating rate and production efficiency by reducing the number of stops for removing adhering substances, and to eliminate defects such as yarn breakage and fluff, and to improve quality. · It is possible to manufacture high-quality synthetic fibers with excellent quality.

 In particular, when high-strength fibers for industrial use are manufactured by a high-speed direct spinning and drawing method, it is more effective because deposits on the godet roller can be suppressed. Example

 Next, the present invention will be specifically described with reference to Examples and Comparative Examples.

 The evaluation of each characteristic in the following examples was performed according to the following methods.

[Surface roughness] Surface roughness of godet roller ”According to ISB 0601, using a Surfcorder SE 1700 manufactured by Kosaka Lab, stylus radius 2 im, feed rate 0.5 mm, cut height 0.8 mm or 2 The roughness curve of one surface of the godet opening was calculated from the measured cross-sectional curve, with .5 mm.

 (Melting point)

 A 2 mg sample was melted using Perkin Elmer DSC-7, quenched and solidified with liquid nitrogen, and the sample was obtained by scanning at a rate of 20 ° C / min. It was determined from the calorific value change trace. The melting point was the temperature of the maximum endothermic peak. The melting point of the drawn yarn obtained by the present invention was 250 ° C.

 [Godette roller temperature]

The godet roller surface was measured using a contact thermometer.

 (Stretching tension)

 The tension of the running yarn between the third godet roller and the fourth godet roller was measured using a tension meter HS-3000 made by E IKO SOKK I, and the tension was determined by dividing by the total fineness of the drawn yarn.

 [Single thread break]

 The number of single yarn breaks was counted by a single yarn break detection device, and the number of single yarn breaks per 10 million m was expressed.

 [Roller dirt]

 The state of the yarn path on the roller was visually observed every 24 hours, and it was determined that 0 was slight dirt, Δ was dirt, and X was dirt and the yarn was large.

[Thread break] The number of yarn breaks per day was expressed.

 [Strength of raw yarn]

 It was measured based on JIS L-1 0 17 (1 995). That is, using a Tensilon tensile tester manufactured by Orientec, an SS curve was obtained under the conditions of a sample length of 25 cm and a tensile speed of 30 cm / min, and values were read from the SS curve.

 (Dry heat shrinkage)

 The obtained yarn was placed in a skein shape, left in a temperature control room at 20 ° C and 65% RH for 24 hours or more, and then measured under a load corresponding to 0.1 gZd of the sample. A sample of length L 0 was left in an oven at 150 ° C for 30 minutes in a tensionless state, then removed from the oven, left in the temperature control room for 4 hours, and measured again with the above load applied. L1 was calculated from the following equation.

Dry heat shrinkage (%) = {(L 0-L 1) ZL O} X 100

Example 1

 A polyethylene terephthalate chip having an intrinsic viscosity (IV) of 1.19 was supplied to an extruder-type melt spinning device, and two yarns were spun at the same time. The spinning temperature was 300 ° C., the mixture was filtered through a metal filter having a gap of 15 im, and spun through a spinneret having 72 holes.

The spun yarn was passed through a high-temperature atmosphere at 300 ° C between 35 Omm from the die surface, and then cooled and solidified by blowing cold air at about 20 ° C. After that, apply oil with an oiling roller, take it off with the first godet roller, and press the obtained undrawn yarn between the first godet roller and the second godet roller 1.06 times without winding it. Perform retouching, and then between the second godet roller and the third godet roller. Stretched 70 times and stretched 40 times between the third and fourth godet rollers, and relaxed 1.0% between the fourth and fifth godet rollers. Then, two yarns were wound simultaneously with a winder at a speed of 330 OmZ to obtain a drawn yarn. Here, the third and fourth Gode' Bok roller surface was used as the R a = 1. Cr ₂ 0 ₃ co one coating is a so-called satin finished surface of the 0.

 The temperature of each godet roller is 70 ° C for the first godet roller, 100 ° C for the second godet roller, 120 ° C for the third godet roller, and −40 ° for the fourth godet roller. C, the fifth godet roller was not heated. The number of windings of the yarn on each godet roller is three for the first godet roller, three for the second godet roller, four for the third godet roller, and seven for the fourth godet roller. The 5th Godet Roller was set to 5 times. For the yarn being wound by the fifth godet roller, a single yarn breakage detecting device was installed, the number of which was counted, and the number of yarn breakages was also evaluated.

 In the above stretching and heat treatment steps, the focusing guide (6) provided in front of the first godet roller (18) shown in Fig. 1 is reciprocated to move the yarn (23) on the godet roller. Traverse was performed in the direction of the rotation axis of the roller. The focusing guide was shaped as shown in Fig. 3.

 Here, the yarn width XF was 5. Omm, the yarn pitch XP between adjacent yarns was 15. Omm, and the value of 2 (XP-XF) was 2 Omm.

As a mechanism for reciprocating the focusing guide, a cam attached to a shaft and connected to the focusing guide is rotated via a shaft by a drive motor, and the focusing guide is rotated by a godet roller along a groove of the cam. It is reciprocated in the axial direction. The reciprocating motion cycle was set to 30 seconds by setting the rotational speed of the shaft to 2 rpm using a drive motor and a reduction gear, and the width of the traverse on the take-up roller was set to 16 mm. . Table 1 also shows these conditions and the results of evaluation of roller contamination, single yarn breakage, yarn breakage, and dry heat shrinkage of the obtained raw yarn.

 In Example 1, by traversing the yarn on the godet roller, the condition of the godet roller surface can be maintained at a low level of dirt until the fourth day. The effect that remarkably few thread breaks were observed was observed.

Example 2

 In Example 1, a device having a structure shown in FIG. 3 was used as a yarn traverse device. The position of the focusing guide, the shape of the cam, and the number of rotations of the shaft were the same as in Example 1. The stretching assist device was provided between the second godet roller and the third godet roller, and reciprocated in synchronization with the focusing guide. Table 1 also shows these conditions and the results of the evaluation of roller contamination, single yarn breakage, and yarn breakage.

Example 3

 In Example 2, a yarn traverse device having a structure shown in FIG. 4 was used. The position of the stretching assist device (5) was set between the second godet roller and the third godet roller in FIG. The shape of the cam and the number of rotations of the shaft were the same as in Example 1. Table 1 also shows these conditions and the results of evaluating roller contamination, single yarn breakage, and yarn breakage.

 As a result, as shown in Table 1, good results equivalent to Example 2 were recognized.

Example 4 One Example 8

In Example 2, the conditions were changed as shown in Table 1. Table 1 shows the results obtained. It described in.

Comparative Example 1

 Melt spinning of polyethylene terephthalate and rate was performed under the same conditions as in Example 1 except for the conditions shown in Table 1, and the yarn was wound around each godet opening without reciprocating the focusing guide. Table 1 also shows the results of evaluation of winding with a winder, roller contamination, single yarn breakage, and yarn breakage. As a result, when the yarn was not traversed on the godet roller, the condition of the roller surface could be kept lightly stained until the second day, but the single yarn breaks sharply on the third day. After that, it became a state where winding could not be performed, and the yarn breakage tended to be extremely poor.

Comparative Example 2—Comparative Example 6

Except for the conditions shown in Table 1, melt spinning of PET was performed under the same conditions as in Example 2. Table 1 shows the obtained results.

table 1

 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Comparative example 6 With or without air guide No Yes y Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes No 16 16 0 8

 Reciprocating cycle (sec) 30 30 30 30 30 30 30 5 1 1 30 30 30 3

£ 3—La_dirty 1 statement 〇 O 〇 〇 O O O 0 O o o O 〇 △

 2 statement o o o o o o o o o o o o ΔX

 3 statement o o o o 〇 o o o X X 〇 o X

 4 statement o o o o 〇 o o △ 〇 Δ _

 5 statement Δ Δ Δ Δ Δ Δ o X 1 〇 X 1 1 Single thread break 1 statement 5 4 4 4 4 4 5 7 12 5 4 4 5 35 0 \

(10m 10m) 2 9 8 Θ 10 9 10 6 12 28 20 7 25 21 60

 3 statement 15 13 13 19 14 18 9 19 60 52 12 32 60

 4 Statement 22 20 21 26 21 26 15 32 26 36

 5 29 29 25 25 32 25 30 20 60 30 60

 Thread breaks (times / say) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.3 1.0 1.0 0.2 0.5 1.4

 3.4 Goddet roller Ra (m) 1 1 1 1 0.5 4 1 1 1 0.3 1 1 6.0

 4th Godet roller temperature (° C) 240 240 240 240 240 240 240 240 240 240 240 160 240 240 240

Stretch ratio (times) 5.2 5.5 5.5 5.5 5.5 5.5 5.2 5.5.4.9 4.9 4.9 4.7 4.8 4.8 Fineness (dtex) 1100 1100 1100 1100 1100 1100 230 1100 1100 1 100 1100 1100 1100 1100 Strength (cN / dtex) 7.0 7.5 7.5 7.5 7.5 7.5 7.0 7.5 "6.0 6.0 6.0 5.8 5.8 5.8 Tension (cN / dtex) 1.6 1.7 1.7 1.7 1.7 1.7 1.6 1.7 1.4 1.4 1.4 1.3 1.4 1.4 Dry heat shrinkage (%) 6.2 6.7 6.5 6.5 6.6 6.5 6.2 6.5 5.5 5.5 15.5 4.5 5.5 5.5

Industrial applicability

 As described above, according to the synthetic fiber manufacturing method and the yarn traverse device of the present invention, by preventing the deposits from being deposited on the godet roller, the godet roller can be kept in the initial state for a long time. In addition to being able to maintain high quality, it is possible to increase the operating rate and production efficiency by reducing the number of stops for removing adhering substances, and to eliminate defects such as yarn breakage and fluff. It is possible to produce high-quality, high-strength synthetic fibers. In particular, when producing high-strength industrial fibers by the high-speed direct spinning and drawing method, it is possible to suppress the deposition of deposits on the godet roller, which is suitable for the industrial high-strength synthetic fiber production process. Available.

Claims

The scope of the claims 1. A method for producing a synthetic fiber in which a melt-spun synthetic fiber yarn is subjected to multi-stage drawing and heat treatment using a plurality of godet rollers, and subsequently wound, wherein at least two sets of the godet rollers are used. The roller surface roughness Ra is in the range of 0.5 to 5 im, and at least one pair of these godet rollers has a godet roller surface temperature of not less than (the melting point of the synthetic fiber is 170 ° C) or more. A method for producing a synthetic fiber, characterized by using a godet roller and reciprocating a yarn in a rotation axis direction of the godet roller.  2. The method for producing a synthetic fiber according to claim 1, wherein the yarn tension at the time of the final drawing of the multi-stage drawing is 1.4 cNZdtex or more.  3. The method for producing a synthetic fiber according to claim 1, wherein the synthetic fiber yarn has a length of 200 dtex or more.  4. A method for producing synthetic fiber that is stretched and heat-treated by using a plurality of godet rollers on a melt-spun synthetic fiber yarn, and subsequently wound, before turning the yarn to a godet roller immediately after spinning. And a yarn convergence guide for passing the yarn after turning or turning, and one or a plurality of extension assist devices arranged between the plurality of godet rollers to synchronize the yarn with the godet roller. Reciprocating in the direction of the rotation axis of the synthetic fiber.  5. The method for producing a synthetic fiber according to claim 4, wherein the stretching is a multi-stage stretching of at least two or more stages. 6. The yarn according to claim 1, wherein the yarn is a multi-thread of at least two yarns. 6. The method for producing a synthetic fiber according to any one of the ranges 1 to 5.  7. The method for producing a synthetic fiber according to any one of claims 4 to 6, wherein the drawing assisting device is a yarn entanglement device.  8. The method for producing a synthetic fiber according to any one of claims 1 to 7, wherein a reciprocating width Y (mm) in the reciprocating motion satisfies the following expression (1).  X F≤Y≤ 2 (XP-X F)  In the formula, XF indicates the yarn width (mm), and XP indicates the yarn pitch (mm) between adjacent yarns.  9. The method for producing a synthetic fiber according to any one of claims 1 to 8, wherein a cycle of the reciprocating motion is 5 seconds or more.  10. An apparatus used in a method for producing a synthetic fiber in which a melt-spun synthetic fiber yarn is drawn and heat-processed through a plurality of godet rollers and wound up. A yarn bundling guide for passing the yarn before and after or after turning, a drawing auxiliary device arranged between a plurality of godet rollers, and a yarn collecting and guiding device and a drawing auxiliary device. A yarn traverse device characterized by comprising a means for synchronizing. 1 1. Means for synchronizing the yarn collecting guide and the drawing auxiliary device are a drive motor, a shaft attached to the drive motor in the direction of the rotation axis of the godet roller, and a drive motor. Means for converting the rotational movement connected to both the focusing guide and the drawing assist device into reciprocating movement, respectively. By such means, the yarn focusing guide and the drawing assist device are each turned by the godet roller. Claim 10 characterized by being configured to reciprocate in the direction of the axis of rotation. The yarn traverse device according to the paragraph.  12. The means for synchronizing the yarn collecting guide and the drawing assisting device include at least two drive motors, a shaft attached to each of the drive motors in the direction of the rotation axis of the godet roller, A yarn focusing guide attached to the shaft and a means for converting the rotational movement connected to each of the drawing assisting devices into a reciprocating movement, and the yarn focusing guide and the drawing assisting device are respectively provided by such means. 10. The yarn traverse device according to claim 10, wherein the yarn traverse device is configured to reciprocate in a rotation axis direction of a godet roller.  13. The means for synchronizing the yarn collecting guide and the drawing assisting device has at least two phase detecting means for detecting that the shaft attached to each of the drive motors has rotated to a predetermined position. When the predetermined position is detected by one of the phase detecting means, the rotation of the shaft provided with the phase detecting means is stopped, and when the predetermined position is detected by the other phase detecting means, the stopped shaft is rotated. 13. The yarn traversing device according to claim 12, wherein the yarn traversing device is configured to cause the yarn traversing.  14. The yarn traverse device according to any one of claims 10 to 13, wherein a speed reducer is provided between the shaft and the drive motor. 15. The yarn traverse according to any one of claims 10 to 14, wherein the cycle of the reciprocating motion of the yarn collecting guide and the drawing auxiliary device is 5 seconds or more. apparatus. 16. The yarn traversing device according to any one of claims 10 to 15, wherein the yarn collecting guide and the drawing assist device are for a plurality of yarns. 17. The yarn traverse device according to any one of claims 10 to 16, wherein the drawing assisting device is a yarn entanglement device.